On Tue, 24 Jul 2018, Srivatsa S. Bhat wrote: > However, if you are proposing that you'd like to contribute the enhanced > PTI/Spectre (upstream) patches from the SLES 4.4 tree to 4.4 stable, and > have them merged instead of this patch series, then I would certainly > welcome it! I'd in principle love us to push everything back to 4.4, but there are a few reasons (*) why that's not happening shortly. Anyway, to point out explicitly what's really needed for those folks running 4.4-stable and relying on PTI providing The Real Thing(TM), it's either a 4.4-stable port of http://kernel.suse.com/cgit/kernel-source/plain/patches.suse/x86-entry-64-use-a-per-cpu-trampoline-stack.patch?id=3428a77b02b1ba03e45d8fc352ec350429f57fc7 or making THREADINFO_GFP imply __GFP_ZERO. (*) IBRS is not upstream, we historically have had very different x86 codebase compared to either 4.4, 4.4-stable or current Linus' tree, and there are simply too many things happening right now to give this high enough priority, sadly. We're not fully-dependent downstream consumer of -stable any more, so this is one of the expected outcomes, unfortunately; we don't immediately benefit from pushing our downstream changes to stable, as we have to carry those over forward ourselves anyway. Thanks, -- Jiri Kosina SUSE Labs
